/Engine/Source/Runtime/SlateCore/Public/Brushes/SlateBoxBrush.h
Make a 3x3 box that stretches the texture.
FSlateBoxBrush ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * InResourceObject, const [FMargin](API\Runtime\SlateCore\Layout\FMargin) & InMargin, const [FSlateColor](API\Runtime\SlateCore\Styling\FSlateColor) & InColorAndOpacity, [ESlateBrushImageType::Type](API\Runtime\SlateCore\Styling\ESlateBrushImageType__Type) InImageType )